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'We need women at all levels'

Women are founding business at one and a half time the national average, according to an infographic from MBA@UNC. However, 40 percent of large publicly owned companies don't have any women on their boards.

Facebook used to be one of those companies, until it added Sheryl Sandberg, the company's chief operating office, to its board last month. Sandberg is among the female business leaders quoted in this infographic about Women @ Work: